Stonecutter



April 15, 1930. 'A, w, WOLFE 1,754,539

STONE CUTTER Filed Aug. 20, 1927 2 Sheets-Sheet l April 15, 1930.

A. W. WOLFE STONE CUTTER Filed Aug. 20, 1927 2 Sheets-Sheet 2 llllllllllllllIlllllllllllllllll|||I l HIIIIII Patented Apr. 15, 1930 UNITED STATES PATENT OFFICE STONECUTTER Application filed August 20, 1927. Serial No. 214,239.

This invention relates to stone cutting machines, and has for one of its objects to provide a novel, simple and highly eflicient machine of this character which shall be ess pecially adapted to be used for the purpose of manufacturing grind stones, pulp stones and the like from blocks of stone.

The invention has for a further object to provide a machine of the character stated which will include an annular series of cutters so angularly related to each other and to their axis of rotation as to permit them to be advanced through the block of stone at the expenditure of comparatively little en- The invention has for a further object to provide a machine of the character stated with means through the medium of which the cutters may be readily secured to or removed from the cutter head, whereby to permit dulled cutters to be replaced in such a comparatively short time as to prevent the machine. from remaining idle for an appreciable period of time.

The invention has for a further object to provide a machine of the character stated with novel means for advancing the cutters through the block of stone and with novel means for returning the cutters to their initial position.

With the foregoing and other objects in View, the nature of which will appear as the description proceeds, the invention. consists in the construction, combination and arrangement of parts hereinafter fully described and claimed, and illustrated in theaccompanying drawings, wherein:

Figure 1 is a view part1 in side elevation and partly in vertical section of a stone cutting machine constructed in accordance with my invention;

, Figure 2 is the view partly in top plan and partly in horizontal section of the machine; Figure 3 is a view in side elevation of one set of the cutters and the holder therefor;

Figure 3 is a view partly in edge elevation and partly in section of a set of the cutters and of the holder therefor.

Figure 4 is a view similar to Figure 1 looking at the machine from another directlon;

Figure 5is a view partly in top plan and partly in horizontal section of the means by which the cutter advancing means is connected to the cutter head;

Figure 5 is a vertical sectional view of said connecting means, and

Figure 6 is a top plan View of the means for returning the cutters to their initial or raised position.

The frame of the machine which is made from angle iron, comprises legs 1, top side bars 2, intermediate sidebars 3 and 4, and bottom side bars 5. The bars 3 are straight and arranged directly opposite each other, and the bars 4 are arcuate and arranged directly opposite each other with their concave sides innermost. The bars 5 are arranged at those sides of the frame to which the bars l are connected. The frame also comprisesbraces 6 which are arranged at the corners thereof and secured to and between the bars 3 and 4, and a central cross bar 7 which is arranged in a plane between the bars 4 and secured to and between a pair of the bars 2. The frame also comprises a bar 8 which extends from the bar 7 to one of the bars 2 that are arranged parallel to the bar 7. The parts of the frame may be welded together or secured in any other manner. An electric motor 9 is mounted uponthe frame at one corner of the latter. A pulley 10 is fixed to the armature shaft of the motor, and has a driving connection with the wheel 11 through a belt 12. The drive wheel 11 is fixed to a shaft 13 which is journaled in'bearings 14 extending upwardly from the bar 7. A bevel pinion 15 which is fixed to the shaft 13, meshes with a bevel gear wheel 16 which is rotatably mounted upon the bar 7. The gear 16 is provided with an upstanding hub 18 which is provided with an axial bore of angular formation in cross section for the reception of an angular shaft 19. This shaft extends above and below the gear 16, is adjustable axially with respect thereto, and is secured against accidental axial movement by a, set screw 20. The shaft 19 is provided with an axial bore 19 which terminates short of the lower end of the shaft and communicates at its lower end with outlet ports 19 opening are" nrna'l'edinbearin as}:

out through the sides of the shaft. A tube 21 extending from a source of water, and coupled, as at 21, to the upper end of the shaft 19, conveys water to the bore 19* of the shaft, the water flowing from the discharge orts 19" upon the block of stone from whic the grind stone or the like is being out.

A hallow {cylindrical cutter head 23 which is closed at its upper end and fully opened at its lower end, is connected to the shaft 19 for rotation therewith and for vertical movement with respect thereto. The cutter head 23 is connected to the shaft 19 through the medium of a cylindrical block 22 formed on or made separately and welded to the closed end of the cutter head and provided with an opening 22" of angular formation in cross section for the reception of the shaft. An annular and sectional cutter carrier is secured to the cutter head 23 by bolts 24. The cutter carrier 25 is applied to the outer side of the cutter head 23 and extends below the lower .end thereof. Cutter holders 27 are provided with slots 27* forthe reception of the rojecting portion of the cutter carrier 25. ehdlders 27 are provided at their forward and rearward sides witharms-28 which are secured'to the holders by bolts 29 for adjustment inwardly and outwardly with res to the axis of rotation of the cutter head 28. The arms 28 are provided in their lower ends with slots 28 which extend forwardly-and rearwardly thereto and are provided for the reception of the cutters 30. The eatters 30 which are of the disc type and made from black diamond tool steel, are rotataBly supported in the arms 28 by pins 31. the pair of the cutters is arranged in alignment with the carrier 25, andthe cutters of the remaining pairs are arranged in a progressi'vely increasing angular relation with I'GSPGCttO the carrier, the angular cutters being alternately arranged inwardly and outwardly of'the plane of the carrier. This arrangement of the cutters 30 provides the necessary clearance for the cutters and enalfles them to be forced through the block with the expenditure of comparatively little energy. As the cutters are carried by holders pivotal-1y associated witha carrier 25, they may be readily adjusted into the required b anguilar arrangement with respect to their axesefrotation. The formation of the carrierflfiinseetions, permits one section thereof and the cutters carried thereby to be removed-from thecutterhead '23 and a new section new cutters may be secured to the-cutter head. iDue --thereto it is not necessary tokeep-the machine idea-l when one or The cutters rotate in a clockwise direction as viewed-in Figure 2,-andthey are fed downwardly through the block by screws38 which 156 secured, as at 57, bottomibars 5 an inbearings'fit? which are fixed upon those top bars 4 situated im mediately above the intermediate bars 4. The screws 38 are of the left hand type, and are engaged with blocks 52 which are secured to and within the ends of a yoke 54 by bolts 53. The yoke 54 extends across the cutter head 23, and is secured thereto by pivots 55. The screws 38 are arranged at opposite sides of the cutter head 23, and the yoke 54 is connected pivotally between its ends to the cutter head,-and the connection between the yoke and cutter head is made at the center of the latter and at points in opposite sides of the shaft 19, whereby to apply the downwardly impelling power for the cutter head at the cutter .of the latter.

The screws 38am provided at their upper ends with sprocket wheels 39, and a sprocket chain 40 passes about the sprocket wheels, to insure the rotation of the screws simultaneously and at the same rate.

The screws 38 are rotated from the gear 16 by a cam 17 fixed to a hub 18 of the gear, a pawl 32 slid ably mounted in bearings 35 extending upwardly from the bar 8, and a ratchet wheel 37 fixed to one of the screws. The pawl 32 has one of its ends arranged in engagement with the ratchet wheel 37, and it is provided at its other end with a roller 36 contacting with the cam 17 The pawl 32 is constantly urged in the direction of the cam 17 by a coil spring 33 which is mounted upon the pawl between one of the bearings 35 and a collar 34 fixedto the pawl.

The cutter head 23 is "held against any radial movement or play with respect to the shaft 19 in order to insure the cutters 30 passing straight down through the block of stone. The passage of the cutters 30 through the block is facilitated by the water issuing from the ports 19 of the shaft 19, the water flowingacross the top of the block from the shaft to the cutters. The means for holding the cutter head 23 against radial play comprises rollers 41 which contact with the outer side of the cutter head and are carried by bolts 42 connected to the braces 6 for adjustment on and from the cutter head by nuts 43, the nuts being engaged with the bolts and contacting'withthe inner and outer sides of the races.

The cutter head 23 may be raised or returned to its initial position manually or mec'ha-nically. Whenit is to be raised manually a crank handle 44 is secured to one of the screws 38. \Vhen it is to be raised mechanically the means shown in Figure 6 is provided. This means comprises a pinion 45 fixed to the shaft 13, a pinion 46 meshing with said first pinion and connected to a shaft 47 journaled in bearings 47 extending outwardly from one of the bars 2, and a bevel pinion 40 fixed to the shaft 47 and meshing with a bevel gear wheel 50 fixed to one of the screws 38. The gear 46 is connected to the shaft 47 by means of a spline 48, and it may be moved on the shaft into and out of engagement with the gear 15. A lever 51 engaging in a groove formed in the hub 46 of the gear 46 and pivoted in a suitable manner to the frame, provides means by which the gear 46' may be moved into and out of engagement with the gear 45. The gear 46 is normally out of engagement with the gear 45, and is moved into engagement therewith only when it is desired to raise the cutter head 23.

The tensioning means for the belt 12 comprises a pulley 58 carried by an angle lever 61 pivoted as at 61 to the frame, a hand lever 59 pivoted as at 62 to the frame, a link 60 connecting the levers, and lugs 63 carried by the legs 1 and adapted to be engaged by the lever 59 to hold it and the lever 61 in adjusted position.

From the foregoing description, taken in connection with the accompanying drawings, the advantages of the construction and of the method of operation will be readily apparent to those skilled in the art to which the invention appertains. While I have described the principle of operation of the invention, together with the device which I now consider to be the best embodiment thereof, I desire to have it understood that the device shown is merely illustrative, and that such changes may be made when desired as are within the scope of the invention as claimed.

Having thus fully described my invention what I claim and desire to secure by Letters Patent is:

A machine of the character set forth, comprising a head, cutters carried by the head, feed screws arranged at opposite sides of the head, a member engaged with the screws and pivotally connected to the head, a shaft with which the head is slidably associated, means connecting the screws for simultaneous movement, a ratchet wheel fixed to one of the screws, a cam fixed to the shaft, a spring pressed pawl engaged with the ratchet wheel and contacting with the cam, and means for rotating the shaft.

In testimony whereof I aflix my signature.

A. W. WOLFE. 

